Test tube heating apparatus



July 5, 1932. l. LAMSTEIN TEST TUBE HEATING APPARATUS Filed June 6, 1928 INVENTOR Patented July 5, 1932 UNITED STATES IRVING LAMSTEIN, OF BROOKLYN, NEW YORK TEST TUBE HEATING APTARATUS Application filed June 6, 1928, Serial No. 283,348.

This invention relates to electrical heating apparatus and more specifically to apparatus.

adapted to heat a plurality of test-tubes simultaneously. An object of the invent-ion is to provide an electrical apparatus for laboratories, in which a number of ordinary commercial test-tubes may be heated without the use of water or a naked flame.

A further feature is in the provision of a heater completely enclosed in a casing arranged to receive one or more test-tubes and which may be readily connected with a source of electrical energy and as easily disconnected, the device being movable as occasion requires.

Another aim is to produce a portable electrical heating device capable of receiving test tubes in either an upright or inclined position in which they are retained during the heating operation.

These and other advantageous objects are accomplished by the novel construction and combination of parts hereinafter described and shown in the accompanying drawing, constituting a material part of this disclosure, and in which:

Figure 1 is a perspective view of an embodiment of the invention showing test-tubes in upright and inclined positions therein.

Figure 2 is a side elevational view with the casing partially broken away to show the construction.

Figure 3 is a top plan view with the cover 35 and tube guide broken away.

Figure 4 is a transverse sectional view, showing two tubes in operative position.

The apparatus as shown consists of a rectangular casing, generally designated by the to numeral 10, having a fixed inset bottom 11 and a removable cover 12 provided with town-turned engaging flanges 13.

Extending centrally through the casing is an upright partition 14 held at its end and bottom edges to the interior of the casing by a series of lugs 15 sheared from the casing walls and inbent to contact with opposite sides of the partition, this partition being a sheet of mica or similar dielectric material.

Spaced below the cover plates 12 are two horizontal guide plates 16l6 held by flangedlugs 19 to the cover, which is provided with a plurality of openings 20 in register with similar openin s 21 in the guides, these openings being tive of the test tubes X, the lower closed ends of which rest upon the raised bottom or flooring 11.

In the side walls of the casing are other openings 22 through which the tubes X may be entered to rest on the flooring 11 in an inclined position, as seen in Figures 1 and 4, the openings 22 being in planes intermediate the planes of the openings 2021.

Fixed in insulating bushings 23, set in one of the end walls of the casing, are terminals 24-24 adapted to be respectively engaged by the sockets of conductors from any convenient source of electrical energy in a well known manner.

The heating elements consist of flat coils 25 of high resistance wire disposed vertically within the casing, and supported by the partition 14 in such manner as to avoid interference with tubes disposed in the openings 2021 and 22, these coils being in circuit with the terminals 2424 by conductors 26-26 at their respective ends.

From the foregoing it will be seen that any number of tubes, within the capacity of the apparatus may be heated at one time, that their entry or removal is of the simplest character, and that no steam, water or flame is employed.

As changes of construction could be made within the scope of the invention, it is intended that all matter contained in the foregoing description or shown in the accompanying drawing shall be interpreted as illustrative and not in a limiting sense. 9

Having thus described the invention, what is claimed as new and desired to secure by Letters Patent, is:

1. A test-tube heater comprising a casing having a cover, a plate carried in spaced relation below said cover, said cover and plate having registering openings to guide tubes vertically therein, openings in the side walls of said casing to receive tubes in an inclinedv position, a raised bottom in said casing to loosely recep support the ends of tubes entered therein, high resistance coils disposed in the casings, and electrical connections to energize said C01 s.

2. A test-tube heater comprising a casing having a cover, means in said casing to support test tubes in a variety of angular positions, a vertical dielectric partition centrally Within the casing, high resistance heating coils supported vertically on each side ofsaid partition, non-conducting bushings fixed in the casing Walls, electric terminals fixed in said bushings, and connections between said terminal and coils.

In Witness whereof, I have hereunto set my hand this 28th day of May 1928.

IRVING LAMSTEIN. 

